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Wrapping the jpeg support library for tcl is a bit more complicated
than libz, or libpng.
(1) libjpeg comes with its own configure command, and there is no
configure.in. This means that it is not possible to lift the
relevant sections out of it for the configure of the
binding. Instead the binding run the configure of libjpeg
(AC_CONFIG_SUBDIRS) from its own configure and uses the
resulting header file (jconfig.h) as usual. A quirk is that
the tcl binding is a subdirectory of libjpeg, but to be able
to perform the previous operation its has to be the other way
around (AC_CONFIG_SUBDIRS is unable to handle '..'
correctly). To facility this I placed a symbolic link into the
directory of the binding, refering to the parent under the
name libjpeg.
(2) A second trouble spot is described in the file 'DANGER'.
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